I see you have what appears to be a mopar electronic ignition with a hotter coil and possibly no ballast resistor.
Too much advance on the timing can do funny things to your crankcase pressure and the the pcv valve.
Back your timing down 4 degrees. and see if that 100% cures your problem.
Report back, then we can talk about what wide plug gaps can do to your timing with an other than stock ignition system.
If by chance you are running 18 degrees BTDC (advanced) along with the faster burning hotter spark, it's going to be too much timing and you need to back it down so that fireball is exploding in the combustion chamber at just the right time for your layout.
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